Evaluation of 3D optical techniques for modal analysis during climatic test inside environmental chamber

The increasing demand for ensuring the reliability of industrial components under diverse temperature and dynamic solicitations has led to develop standards and testing methods that incorporate both thermal and vibration loads to analyse the dependency of mechanical properties with temperature. This research presents an assessment of a novel experimental approach that combines 3D full-field optical techniques and an environmental chamber to perform modal identification under different temperatures. The study performs a thorough comparative of scanning Laser Doppler Vibrometry (SLDV) and Digital Image Correlation (DIC) techniques. By integrating the environmental chamber with these optical methodologies, valuable insights into the behaviour of components were obtained. Both SLDV and DIC successfully identify variations in modal parameters due to temperature changes. Nevertheless, the results obtained employing SLDV were proved less effective for a reasonable test duration.